Rotary blower.



- T. w. GREEN.

ROTARY BLOWER.

(Application filed Feb. 14, 1900. (N o M o d g Patented May 2|, I9 0l.

Inventor.

Attorney.

UNITED STATES PATENT Grinds.

THOMAS W. GREEN, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR. TO THE WVILBRAHAIVLBAKER BLOWER COMPANY, OF SAME PLACE.

ROTARY BL OWER..

SPEGLFIGATION formingpart of Letters Patent No. 674,536, dated May 21, 1901. Application filed February 14, 1900. Serial re. 5,121. on modem To all whom it may concern: or drawn inside of the blower and forced into Be it known that I, THOMAS W. GREEN, a the air-tubes connected therewith. Itherefore citizen of the United States, residingin Philaform around the impellershafts, just inside (lelphia, in the county of Philadelphia and of the gear-housing, an annular groove that 5 State of Pennsylvania, have invented certain connects with a way or channel leading down-' new and useful Improvements in Rotary wardly to the outside ofthe blowercase. This Blowers; and I do declare the following to be annular groove will intercept the oil in' its a full, clear, and exact description of the inpassage along the shaft and the downwardly 6o vention, such as will enable others skilled in inclined channel will cause it to flow outside I0 the art to which it appertains to make and of the machine. To insure the passage of the use the same, reference being had to the acoil down this channel, I place across the top companying drawings, and to the letters of thereof a thin piece of steel that will act as a} reference marked thereon, which form a part scraper. of this specification. In the accompanying drawings, Figure 1 is [5 My invention relates to rotary blowers; and a view in perspective of my improved rotary the improvement consists in the construction blower, showing one end thereof in section. and arrangement of the several parts of the Fig. 2 is an end elevation of the blower, showmachine, as will be hereinafterdescribed, and ing the end of one impeller in section, as ona more fully pointed out in the claims. Usuline 00 w of Fig. 1.

2o ally in machines of this class the journal- A is the outer casing, surrounding the imboxes in which the impeller-shafts revolve pellers of the blower. are placed outside of the pillow-blocks that A is one of the impellers inside of the eassupport the machine upon its foundation. ing, and A the solid head on the end of the This construction makes it necessary to bolt impeller.

' 25 the journal-boxes upon the outer sides of the B B are the driving-shafts of the impellers. pillow-blocks without any support directly B B are the pillow-blocks, one on each side under said journal-boxes, leaving the whole of the blower and cast integral with the gearweight of the impellers to be carried by the housing and the journal-boxes b. bolts that connect the journal-boxes to the O is a gear-wheel on one impeller-shaft and 0 pillow-blocks. As a consequence the blowmeshing into a corresponding gear-wheel on ers have considerable vibration and the bolts the shaft of the other impeller. are liable'to be strained and work loose, there- 0 is a combined gear-housing and oil-box by throwing the shafts out of alinement, makinclosing the gear-wheels on the shafts of both ing frequent repairs necessary. As machines impellers and cast in one piece with the pil- 5 of this class run at a high rate of speed and low-block. In order that the gear-wheel O are generally large and heavy, sometimes may run with the least possible friction, the weighing as much as twenty-five tons, it is gear case or housing 0' is made'oil-tight and desirable to get rid of any tendency to vibrate kept supplied with a suflicient quantity of oil and to make them compact and strong. To to cover the teeth in the wheel. To prevent 4o accomplish the desired results, I cast the pilthe oil being carried from the gear-wheels C low-blocks, gear-housing, and journal-boxes t0 the inside of the blower, I form around the in one piece and of a shape that willv bring driving-shaft of each impeller, between the said pillow-blocks directly under the journals head of said impeller and the gear-wheel, an of the impeller-shaft and place the gearannular groove d, and connect with said an- 5 wheels that convey the power from one imnular groove a downwardly-inclined oil way peller-shaft to the other inside of the journalor channel d, that extends to the outside of boxes and close up to the heads of the impelthe blower. lers. Placing the gear-wheels in such close 6 is a thin strip of steel secured across the proximity to the head of the blower necessitop of the downwardly-inclined channel d o tates the provision of means to prevent the parallel with the driving-shaft. This steel oil that is contained in the case or housing surstrip may be made to extend some distance rounding the gear-wheels from being sucked downwardly into the channel d and the top edge thereof is adjusted so close to the axle that it will act as a scraper to remove the oil from the revolving shaft and deflect it into the channel cl.

When the blower is not operating under a pressure, the annular groove 01 will prevent the oil in the gear-cases from being sucked or drawn into the blower, and when the blower is acting under pressure it will prevent the unclean and gritty oil contained in the gear-cases from being blown outwardly into the journal-boxes of the driving-shafts.

I have shown thegroove d in the part of the head-plate or end casing A that surrounds the driving-shaft; but, if desired, this part of the head-plate may be made to fit snugly around the shafts B and the annular grooves 01 made in said driving-shafts.

The machine being constructed as shown and described, it will be seen that the Whole weight of the impellers is carried by the driving-shafts, the journals of which rest upon the pillow-blocks, and there are no bolts to become unduly strained or loosened, and thus throw the impellers out of aline nent. The annular grooves d surrounding the driving shafts being located between the gear-housing and the heads of the impellers will catch any oil sucked inwardly, and any leakage arising in the blower will find an outlet through the channel d and the gritty oil in the gear-housing-will not be forced into the journal-boxes.

I have shown and described the gear-hous- 1. In a rotary blower, the combination of I the pillow-block B havi'ng thereon the journels d d, said gear-wheels C 0, being covered by the gear-housing and secured upon the driving-shafts B B, between the journalboxes 17 b, and the end of plate A5, substantially as shown and for the purpose described.

2. In a rotary blower, he combination of the impeller-shaft B, surrounded by an an nular groove, with the head-plate A having therein a downwardly-directed channel or Way communicating with the annular groove and thus forming apassage-way or vent extending to the outside of the blower, substantially as shown.

3. A combined vent and oil-escape for the shafts .of rotary blowers that have their gearwheels placed between the journal-boxes and the end head-plate of the blower, said vent and oil-escape consisting of an annular groove surrounding the driving-shaft and comm unicating with a downwardly-directed channel in the head-plate of the blower, said downwardly-inclined channel extending to the outside of the blower, substantially as shown.

4. A combined vent and oil-escape for the driving-shafts of rotary blowers, said vent and oil-escape consisting of an annular groove surrounding the driving-shaft and communicating with a downwardly-directed channel that extends to theoutside of the blower and has fixed in the top portion a scraper adapted to remove the oil from the driving-shaft and deflect it into the downwardly-inclined channel, substantially as shown.

In testimony whereof I affix my signature inpresence of two witnesses.

THOMAS W. GREEN.

Witnesses: I

SAML. H. KIRKPATRICK, THos. D. MOWLDS. 

